Zack Weinberg 4e310e78cb Update documentation of AC_USE_SYSTEM_EXTENSIONS. ... The list of macros documented as being defined by AC_USE_SYSTEM_EXTENSIONS had gotten out of sync with the actual list. Update it thoroughly. Also, I introduced an error into the commentary when I merged Julien ÉLIE’s patch to define _NETBSD_SOURCE and _OPENBSD_SOURCE in AC_USE_SYSTEM_EXTENSIONS. _OPENBSD_SOURCE does something on NetBSD and *doesn’t* do anything on OpenBSD. This is corrected. Clean up the code in AC_USE_SYSTEM_EXTENSIONS a bit while I’m in there; we now had a redundant definition of _NETBSD_SOURCE (one unconditional and one conditional on minix/config.h existing). Reorganize the macro to make it easier to catch problems like this in the future. * lib/autoconf/specific.m4 (AC_USE_SYSTEM_EXTENSIONS): Reorganize; remove redundant AC_DEFINE of _NETBSD_SOURCE; add some missing AC_BEFOREs; use _AC_CHECK_HEADER_ONCE for header checks; revise all commentary. * doc/autoconf.texi (AC_USE_SYSTEM_EXTENSIONS): Update.		2020-12-07 17:17:40 -05:00
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autoconf.texi	Update documentation of AC_USE_SYSTEM_EXTENSIONS.	2020-12-07 17:17:40 -05:00
fdl.texi	make fetch	2020-09-03 12:08:31 -04:00
gendocs_template	make fetch	2020-06-29 17:08:26 -07:00
gnu-oids.texi	make fetch	2020-07-11 11:10:39 -04:00
install.texi	maint: make update-copyright	2020-01-01 11:45:50 -08:00
local.mk	maint: make update-copyright	2020-01-01 11:45:50 -08:00
make-stds.texi	make fetch	2020-06-29 17:08:26 -07:00
standards.texi	make fetch and update savannah gitweb urls to cgit.	2020-11-30 11:45:24 -05:00